It just so happened that Ali Muhammad, 24, was wearing an outfit matching that description earlier in the day at the North Side Tops supermarket, McGunnigle said.

Muhammad later identified himself in Tops security video and admitted he was near the scene of the crime at Park and Oak streets, the prosecutor said.

But defense lawyer Patrick Hennessy said there must have been someone else in the same area with the same outfit. He called it a coincidence.

Hennessy seized on the fact that the shooter was apparently wearing a mask. One was found near the crime scene, but no DNA linked it to Muhammad. In fact, the most authorities could say was that a woman's DNA was on the mask, Hennessy said.

Today, opening statements in Ali Muhammad's murder trial took less than half an hour. McGunnigle said she'd rely on the video evidence of the suspect -- including his outfit -- as well as testimony from a woman he allegedly asked to provide an alibi, as well as a man who drove Muhammad to the scene and away afterward.

Hennessy said none of it will prove, beyond a reasonable doubt, that Muhammad was the killer.

"It's a coincidence, that's it," he said of the unusual outfit.

Ali Muhammad faces up to 25 years to life in prison if convicted of murder. The prosecutor did not offer a motive for the crime during opening statements today.

Editor's note: A previous version of this story incorrectly stated that Ali Muhammad was the brother of another man recently convicted of murder. But there is no relation, according to Ali Muhammad's parents.